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Submitted: Wednesday 14-MAR-2018 09:00 AM
Special Provision #20 – Riprap Acceptance [IMIP 94-4(94)152] – is hereby replaced with the following:
RIPRAP ACCEPTANCE [701]
Rescind and replace the forth sentence of specification 701.06 Riprap that begins with “The stone will be accepted based on” and replace with:
“The stone will be accepted based on visual analysis, the Department’s riprap evaluation form and optical granulometry WipFrag software for the gradation. Submit samples before placing the riprap. Notify the Project Manager within 7 calendar days of stockpiling the stone for quality control (QC) testing. The Department will use WipFrag for gradation analysis before (QC) and after (Quality Acceptance) placement of the stone.  Material placed in its final location not meeting the rip rap gradation in Table 701-21 is unacceptable, unless determined acceptable under Subsection 105.03.”

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Submitted: Monday    05-MAR-2018 11:11 AM
Company: Ed Boland Construction
Contact: Steve Carlson
Pertaining to the Jack and Bore East of Miles City, the existing bore logs terminated at elevations ranging from 2383.6 to 2419.2. Flow line elevations for 54" are, low end 2335.50 and high end 2365.5. This puts the termination of bore logs 18.1' to 53.7' above high end and 48.1' to 72.8' above low end. Are we to assume that the shale formation at bore log termination stays consistent to the depth that is indicated for the jack and bore? If this formation typically runs deep in this area do we know if it gets harder with depth? Do we know if water will be encountered at deeper depths? Any other information you might have would help so we can price this accordingly. Accurate geotechnical information is key to determining equipment needed to assure a successful and cost effective bore completion. Also from the two ends of the 54", how much distance do we have to the edge of easement for pits?
Answer
Submitted: Monday 05-MAR-2018 04:00 PM
A subsurface investigation specific to the proposed jack and bore pipe was not performed.  The boring logs provided in the contract are from a previous project constructed in 2012-2013 at this location (Slide Repair East of Miles City/MT 11-1,  Project number IM ER 94-4(85)151).   The linked geotechnical report was completed for this previous project and provides some information regarding the general subsurface geology in this area. Information in the report indicates the jack and bore installation would encounter formation material associated with the Tullock member of the Fort Union Formation.  CONSULTANT GEOTECH REPORT
The distances along the bearing of the jack and bore from the ends of the pipes to the easement line are as follows:
Upstream end:  96'
Downstream end: 88'

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Submitted: Monday    19-MAR-2018 03:42 PM
Company: Ed Boland Construction
Contact: Steve Carlson
In reference to the bore and jack near Miles City, can the new casing being installed be 58" rather than 54"?
Answer
Submitted: Tuesday 20-MAR-2018 01:17 PM
Yes, 58" can be installed.  However, the energy dissipating ring outside diameter will need to be increased to match the size of the pipe.  In addition, this will make the clearance between the new Jack and Bore pipe and the existing 78" SSPP very tight.

The basis of bid will still be based on the 54 inch casing and the modified energy dissipating ring will still be included in the cost of the pipe.